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Parasitic myomas are an infrequent type of myomas that appear in abdominal cavity. The incidence of this pathology has increased over the past years. There has been many hypothesis about the pathogenesis. One of the most recent ones is in relation to the start of laparoscopic morcellation at myomectomy or hysterectomy to treat uterine myomas due to the small fragments that can be detached during the procedure and that implant themselves in the abdominal cavity. Parasitic myomas, in most cases, are asymptomatic, but it can cause an unspecific abdominal pain, menstrual disturbances, dyspareunia and other gynecological symptoms. Physical exploration in patients is often also normal. The correct identification of parasitic myoma by image tests, such as transvaginal ultrasound, CT or MRI, is still complicated because it is difficult to diagnose due to the unspecific radiological characteristics that show up. CT and MRI give information about the location that could be useful during the surgery. Usually the diagnosis is an accidental finding during an abdominal surgery done for another reason and the histology of the piece is what gives the definitive diagnosis. We present a case of a 32-year-old woman, asymptomatic, after a transvaginal ultrasound is diagnosed a retroperitoneal tumor. The tumor was removed by laparoscopic surgery and the patient had a favourable recovery. The histopathology of the tumor was a parasitic myoma.